migration: allow send_rq to fail
We will not allow failures to happen when sending data from destination to source via the return path. However it is possible that there can be errors along the way. This patch allows the migrate_send_rp_message() to return error when it happens, and further extended it to migrate_send_rp_req_pages(). Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: NPeter Xu <peterx@redhat.com> Message-Id: <20180208103132.28452-9-peterx@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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